Jennifer Aniston & Justin Theroux's Wedding Planning Underway

The actress, 44, is in the process of planning her wedding to screenwriter-actor Justin Theroux, 41 – and she has already checked off some major tasks on her to-do list, including choosing wedding bands, setting a date and narrowing down dresses.

Just don't expect the wedding, which is likely to take place soon after Aniston wraps her current film in Connecticut on March 8, to be a lavish production.

"It will be a small affair with their closest friends," a source close to Aniston tells PEOPLE in this week's cover story.